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1. (WO2001091288) HIGH LINEARITY MULTICARRIER RF AMPLIFIER

Pub. No.:    WO/2001/091288    International Application No.:    PCT/US2001/016046
Publication Date: Nov 29, 2001 International Filing Date: May 18, 2001
IPC: H03F 1/32
Applicants: SPECTRIAN CORPORATION
Inventors: COVA, Armando, C.
CRESCENZI, Emil, J., Jr.
CHANG, Augustin, P.
FOLEY, Stephen, J.
Title: HIGH LINEARITY MULTICARRIER RF AMPLIFIER
Abstract:
A hybrid multicarrier RF power amplifier linearization architecture combines ACT and feed-forward amplifier stages to achieve high output distortion rejection and enhanced amplifier linearity. A carrier cancellation loop (loop 1) is coupled with a main RF power amplifier stage (20) having parallel RF power amplifiers coupled via intermod-complementing predistortion paths. The carrier cancellation loop (loop 1) is coupled to a feed-forward loop (loop 2) containing a feed-forward RF power amplifier, to produce a composite amplified output signal having very reduced intermodulation products. Vector modulators (16) in the main amplifier (20) and feed-forward amplifier stages are controlled by a digital signal processor (50), using outputs from various monitoring subsystems, including pilot tone detection (26), correlator (40), distortion and power detector circuits (80).